Workman&#39;s cage for ladders



Sept. E2, 1933. MURPHY 1,926,696

WORKMANS CAGE FOR LADDERS Filed July 15, 1931 2 Sheets-Sheet 1 2 INVENTOR ATTORNEY James FNLZIPZI}! Sept. 12, 1933. MURPHY 1,926,696

WORKMANS CAGE FOR LADDERS Filed July lsjlesl 2 Sheets-Sheet 2 .INVENTOR Patented 12, 1933 u I 7' r 4 UNITED STATES PATENT: OFFICE;

' I "1,926,696 y u r woaKMANscAGE FORLADDERS J fiJ-amesF. pM urphy; Lansing, Mich; assignoroll one-half to Joseph W. Gleason; Lansing, Mich I Application ute, 1931 vscream). 551,027? g r V p u v Q Claims. (craze-sot V 4 u p This invention relates to workmans cages for "There-may; be any number of rollers 12 on ladders, and belongs intheclass with safety verticalaxesl3 havingcylindricalterminals 14 cages for use on the outer ends of extension'ladweldedin vertical bracket members, 15, which are ders or'booms. It is especially'designed for use themselves welded to branch members 16; The I 5by firemen,'painters and other-workmen who must rollers engage the tubular carrier ring 6 as 0.

. reach conveniently different heights of a wall or shown. The branches 16 are welded at their upother surface, and different locations at, such per ends to the top tube ring 17 of the cage. different heights. The invention comprises pref- It will be observed in Figs. 2 and 3, that the cage erably a cage made of tubular steel members is composed of vertical tubes'18'and horizontal welded electrically or otherwiseone to theother' interrupted tubular rings 19, with a ring tube 5 be as light as is consistent with safety, and of or platform21. maximum strength. It is an object of this in- As best illustrated in Fig. 3, it will be noted that, .yention to construct a cage of the nature stated the vertical bracket tubes carrying roller axes 3 e making the whole practicallyone piece that will 20 atv the'bottom carrying any chosen grating 15 within which a workman may standand which 13 have their upper'ends Welde radial brace 5 will be so arranged that the axis of the cage will tubes 22 from topcage ring 17 welded at their be vertical at all times regardlessof the position ends to an outermost top or contactring tube of the ladder, and it is provided with means 23. It will be observed also in Fig. 3 that-one for holding the cage in any of its positions with ,side ofthe cage is open byreason of the inter- 2 0 respect to the sides of the ladder. It-is also an ruptions in thehorizontal ring tubes 19,. It is object of the special construction embodying this through this opening that a workman may enter invention to locate at the top a hand rail or the cage from the top rung 3a of the ladder,

upper annular tubeor ring. somewhat larger in grasping the top ring 23 with his hands to assist v u diameter than the cage itself and which upper him. i

25 or outer ring or hoop tube may rest against the In theo'peration of this invention, the workside of a building and be moved along'the side man stands upon the platform or grating 21 of as the ladder is moved, and thus space the cage the cage, and by means of the hand lever. 11 somewhatfrom the wall; r V frees the carrier ring 6 which rocks under his The special construction and combinations of weight always into a position with the axis of the 30 parts comprising this invention are illustrated in cage vertical however the sides 3 of the ladder the accompanying drawings, of which Fig.1 rep- -may incline. When the ladder slants towards a resents a top view of all parts assembled. Fig. wall, the top or contact'ring tube 23 rests against 2 is a side view. Fig. 3 is a vertical section on the wall, and the ladder may be moved sidebroken line 3-3 of Fig. 1. Fig. 4 isa detail top wise moving thetube along the wall, the work- 35 view of the brake wheel or cage lock. man being thus supported in the cage at conven- Throughout the drawings and'description. the lent working distance from the wall. The brake, same number is used to refer to the same part. devices are so constructed that by turning the Considering the drawings, there is provided a hand lever 11 into the position indicated by the top fork of strong tubes having the sides 1, 1, with" full lines in Fig. 4. the carrier ring willbe sub- '40 one or more brace tubes 2 suitably located. The stantially locked and the cagewill not rock. 5

lower ends of the'sides 1 are turned inwardly as. The workman may himself move the top of the best shown in Fig. 3 and slip into thetubular sides ladder sidewise by grasping the outer ring tube 3 of the ladder having rungs 3a. Thfeupper ends 23 at thev sides and swinging his body around of the sides 1 are providedwith attached bearings causing the ring 23 to roll horizontally along the 5 4 for trunnions 5 projecting at diametrically'opwall for a. small distance. The tubular 'conpositepoints from a carrier ring tube 6. One struction is so strong that it will withstand the of the trunnions is secured to a brake wheel or roughest usage comparatively without disarthe like 7, havingthe brake band8 adjustably an ement or breaking.

. Fionnected Screw 10 and adapted to be Haying now described the construction of this -upon by the hand lever 11. Those brake elements nt n it I 1 u are of the usual construction and operation, and 1,1 In a cage for ladders, incombination with may be r pla d y a sui a l c triv thesides-of a ladder, a ring havingtrunnions at hajcted for service brake f diametr-icallyopposite points, .the;en ds' of the .yices are best illustrated in Fig. 4. Nuts 9 adJust sides f the ladder having bearings for t band 3 011 Screw 10. ,ception of said .trunnions 'rotatively, means for limiting the rocking movement of the ring ,upcn

itstrunnions, anda cage carried by the ring and having movable supporting devices engaging the ring whereon the cage may. be revolved about a vertical axis in the ring. v n

2. In a cage for ladders, in combination with h the sides of a ladder, aring having trunnions at diametrically*oppositepointsythe ends of the sides of the ladder having'bearings forthe reception of said trunnions rotatively, means-for limiting the rocking movement of the ring uponits trunnions and for holding the ring at differ ent angles with the ladder, and a cagelcarried movably on the ring in adjustable relation.

3; In a cage for ladders, in combination with the sides of a ladder, a carrier ring formed'of a metal tube and having trunnions' at diametrical-- 1y opposite'points, the endof the said ladder having bearings for the said trunnions, means. for

holding the ring in adjusted positions at an angle with the ladder, and a cage having rollers engagingthe said ringtosupport the cage in revo- 1 luble'relation. I .g, I m 4-."In a' cage: for ladders, in combination with the sides of a ladder, a carrier ring formed of a metal'tube and having trunnions at diametrically opposite points'-,the ends of the sides of the ladder having bearings for the said trunnions, means i, for holding-the ring inadjusted positions at an angle with theladder, a cage having at the top a hand rail of greater diameter than the. cage,

and'rollers connected with the saidhand rail and engaging the said carrier ring to support the cage in revoluble relation.

;:5.};In ai cage for ladders, in combination with the sides of aladder, aicarrier ring formed of a metal tube and having trunnions at diametrically opposite points, the sides of the said ladder 'having bearings for the said trunnions, means for holding'the ring in adjusted positions at an angle with the ladder, a cage formed of metal tubes welded together, the-said cage having at the top a handrail tube of greater diameter than the cage, and rollers connected with said hand rail andengaging the said carrier'ring' to support the cage in revoluble relation.

JAMES FIMURPHYQ a 

